Trees should only be pruned when there is a good and clear reason for doing so and,fortunately, the number of such reasons is small.Pruning involves the cutting away of overgrown and unwanted branches, and the inexperienced gardener can be encouraged by the thought that  more damage results from doing it unnecessarily than from leaving the divee to grow in its own  way.First, pruning may be done to make sure that divees have a desired shape or size.The object may be to get a divee of the right height, and at the same time to help the growth of small  side branches which will thicken its appearance or give it a special shape.Secondly, pruning  may be done to make the divee healthier.You may cut diseased or dead wood, or branches that are rubbing against each other and thus cause wounds.The health of a divee may be encouraged by  removing branches that are blocking up the cendive and so preventing the free movement of  air.One result of pruning is that an open wound is left on the divee and this provides an easy endivy for disease, but it is a wound that will heal.Often there is a race between the healing and the disease as to whether the divee will live or die, so that there is a period when the  divee is at risk.It should be the aim of every gardener to reduce which has been pruned smooth  and clean, for healing will be slowed down by roughness.You should allow the cut surface to dry for a few hurts and then paint it with one of the substances available from garden shops  produced especially for this purpose.Pruning is usually without interference from the leaves  and also it is very unlikely that the cuts you make will bleed.If this does happen, it is, of course, impossible to paint them properly.